Inserted pump for oil-wells



T. A. NOHTHRUP.

INSEHTED PUMP FOR OIL WELLS) APPLICATION FILED IuLY I7, I9I9.

Patented May 17, 1921.

l n. l :rain LS1.

UNITED STATES PATENT OFFICE. Y

INSERTED PUMP Fon. OIL-WELLS.

Specification of Letters Patent.

* Patented May 17,1921.

Application iiled July 17, 1919. Serial No. 311,430.

To all whom t may concern.' y

Be it known that I, THOMAS A. NOETHRUP, a citizen of the United States, residing at Washington, in the county of Washington and State of Pennsylvania, have invented certain new and useful Improvements in Inserted Pumps for Oil-Wells; and I do declare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in inserted pumps for oil wells and has for its primary object the provision of a pump, the valves of which are `so positioned as Tto eliminate the accumulation of gas between them.

Heretofore most pumps of this character have been constructed with the valves so remote from each other that gas accumulated between them, thereby causing the plunger vor the working barrel to make a number of strokes without discharging any fluid or oil, but with the valve arrangement herein described, this fault will be eliminated due to the close relationship ofthe valves.

A further object of the invention is to provide a general reorganization of parts which will produce results which have heretofore been unattainable, the chief result being the production of a device which w1ll operate continually for several months without the necessity of withdrawing it from the tubing for the purpose of cleaning or making repairs, whereas pumps of the present day type must `often be removed several times in a single week, either to permit entrapped gas to escape, to remove accumu- `lated sand, or to renew packing cups.

With the above in view the invention consists of certain novel features of construction and in the combination and arrangement of parts as will be more fully described and claimed.

I attain these objects by the construction shown in the accompanying drawings in which- Figure 1 is a longitudinal sectional view of the pump. l

Fig. 2 isa sectional view with parts in elevation.

Fig. 3 isa section taken on line 3-3 of Fig. 1.

Fig. 4 is a lsection taken on the line 4 4; of Fig. 2.

The pump includes broadly, an elongated threaded, said section carrying a fixed collar '2, one end 3 of which is reduced in .diameter and provided with a peripheral groove 4. The lower end 5 of the body is threaded into an extension 6, whose lower end 7 is reduced in diameter and provided with a peripheral groove 8 adapted for reception of the free edge of the flange 9 on the uppermost of the gaskets 10. The lower end of the extension 6 is externally threaded for Vthe attachment of an internally threaded strainer body 11, which in addition to serving as a strainer, retains the gaskets l0 in their proper places, said gaskets being spaced apart by means of a ring 12 loosely mounted on the extension and provided with a decreased end having a peripheral 'gasket flange receiving groove therein.

The pump is insertible in a well tubing C on'the lower end of which is threaded a seat coupling S of less diameter thanthe tubing, said coupling being either threaded .directly on the tubing or connected to it by means of a collar B. The extension 6 is provided on its upper end with a flange or shoulder' which rests on the upper end of said seat coupling lthereby limiting the downward movement of the pump.

The plunger body is held stationary by the gaskets 10 which engage the inner wall of the seat coupling firmly enough to permlt operation of the pump but at the same time permitting removal from the well.,

The threaded upper end of the pipefsection 1 carries ya plurality of downwardly opening cups 13 and spacing rings o r collars 14, said spacing rings having thelr upper ends decreased in diameter and provided with peripheral grooves in the decreased portions, said grooves bemg adapted for reception of the free edges of the downturned flanges 16 of said cups. lock nut 17 is threaded onto the pipe section agalnst the cups, and a hollow extension 18, 1s 1nternally threaded at one end for engagement with the upper end of said plpe sectlon 1,

said extension being screwed up into firmengagement with the aforesaid lock nut 17. The upper end of the extension 18 is externally threaded to receive thereon an'internally threaded valve cage 19 which-is provided with longitudinal slots in its sides and an aperture in its upper end to permit exit of the iuid,vsaid cage also serving to retain a valve seat 20 against the upper end of the pipe section 1 and to prevent dislocation of a ball valve 21.

A working barrel 22 is slidable over said l plunger body and is internally threaded at l eaph end, the lower end 23 having mounted thereon an externally threaded bushing or guide 24, whose lower end is adapted to strike the upper end of the extension 6 to limit the downward movement of the barrel.

A coupling 25 is threaded into the upper end of the barrel 22, said coupling having a central radial flange 26 forming a shoulder to limit the inward adjustment thereof. The upper end of the coupling 25 is reduced in diameter and externally threaded for reception of an internally threaded cage 27 which incloses a ball valve 28, said valve being adapted to normally-restl on a seat 29. The seat is received in an annular groove 30 formed in the inner upper end of said coupling. A threaded stud 31 is formed on the upper end of the cage for connection with a suitable operating rod or cable. v

The barrel 22 is provided with apertures 32 near its lower end for the purpose of permitting sand o r other sediment to escape from the barrel. vThese openings also possess additional functions given below.

In operation the barrel 22 is reciprocated, the upward movement thereof tending to create a vacuum between the valves, thereby opening the lower valve 21, the suction drawing the oil 'or other fluid into the space between the valves and upon the downward movement of the barrel, the lower valve 21 is closed and the upper valve 28 opened, and,

due to the upward pressure on the fluid, it

is discharged through the openin s in the cage 27 into the usual well tubing through which it passes to the surface `of the ground. Should sand or other sediment get past the strainer 11 and the valve 21, it will gradually work its way down b'elow the gaskets 13 and pass out through the apertures 32 into the well. Also, attention may here be dlrected to the fact that when the working barrel 22 descends, oil enters said barrel below the collar 2 and thus relieves the' vacuum which would otherwise be formed. Upon ascent of the working barrel, this oil is forcibly ejected through the openings 32 so as to effectively wash all sand and the like through the well tubing, instead of againl settling into the well, as is the case with a number of pumps now in use. Another and highly important advantage of the openings 32, is that they permit the oil to enter the working barrel and press upwardly against the cups 13, thus always holding these cups expanded tightly against the working barrel so as to prevent leakage and eliminate the necessity of continually renewing the entire pump for adjusting old cups or installingnew ones..

Due to the close relation of the valves the' space is so small that it will prevent the ac# cumulation of enough gas to impede the pumping operation, thus being 1n direct land the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of the claimed invention.

I claim- An inserted oil pump comprising a vertical pipe, means for'securing the lower end of said pipe in a well tubing and sealing the tubing against escape of-oil except through said pipe, an upwardly opening check valve on the upper end of said pipe, downwardly opening cups secured on said pipe, a working barrel slidable over said pipe, said check valve and said cups, an upwardly opening check valve and an openwork cage therefor on the upper end of said barrel to discharge oil from the barrel into the well tubing, and

a guide carried by the lower end of said barrel and slidable on said pipe, said barrel having openings at the upper end of sald guide permitting entrance of oil into the barrel between said guide and cups upon descent of said barrel, and serving to forcibly discharge such oil when the barrel ascends, whereby to wash all sand from said barrel and to agitate the oil in the tubing to prevent accumulation of sand, the upward pressure of the 'oil against said cup serving to force the latter outwardly agalnst the barrel. l

In testimony w my hand.` f

'ereof I have hereunto set 

